Composition of matter.



COATING R PLASTIC.

Patented May as, 1903.

PATENT OFFICE.

HANS MOLCHIN, OF ST. LOUIS, MISSOURI.

COMPOSITION OF MATTER.

sea-momma forming part of Letters Patent No. 729,203, dated May 26,1903. Application filed February 9. 1903- Serlal Ho. 142,674. (Nospecimens.)

To all whom it may concern:

Be it known that I, HANS MOLCHIN, a subject of the Emperor of Germany,residing at the city of St. Louis, State of Missouri, have inventedcertain new and useful Improvements in Compositions of Matter, of whichthe following is a specification.

This invention relates to compositions of matter to be used in makingfireproof brick :e for buildings, partition walls, linings of framework,and the like; and it consists of improvements whereby such compositionsare rendered tougher or capable of resisting a greater tensile strainand capable of greater fire resistance.

The composition consists of a close mixture of calcined gypsum orcalcium sulfatgwhich is ordinarily termed plaster-of-par s, coalcindersmica slaked lime, and si icate of 2 a W -W ,l Zhr 4! The above-mentionedcomponent parts of my new composition are commingled together in thefollowing manner: First of all water is placed in a tank and three percent. of dis- :5 solved lime is poured into it. Then enoughplaster-of-paris mixed with mica is put in the water to make a clingingmass. To this mass is addedsifted cinders of bituminous or anthracitecoal, said cinders being graded either 0 fine or coarse, according tothe size of bricks to be formed of the composition. Beaten or pulverizedbrick may also be used instead of the coal-cinders. The composition isthen stirred rapidly, so that the different elements hereinbefore setforth will be quickly mixed. The mixture at this point is almost readyto be poured into the molds; but before doing so it is necessary to add,just before the mixture is put in the molds, a suitable amount of 0silicate of soda or other ingredient having 1 e proper res. It isimportant to add the silicate of soda in such proportions as to secureits beneficial effects in the composition and to make the resultingproduct most efiicient and at the same time not to put so much silicateof soda in the mixture as to make it non-adhesive or its productbrittle. Without the silicate of soda in the composition it is open tothe objection of being too porous,

which causes it to be absorbent of water to an undesirable degree,whichinjures the practical value of the composition when used as a buildingmaterial exposed to the weather. The addition of silicate of soda to thecomposition makes it more dense and impervious to water and increasesits capacity for withstanding the weather.

The plaster-of-paris in the composition makes it set and adapts it to bemolded. The sifted cinders, pulverized brick, or similar porous articlemakes the material strong, tenacious, and one which is bound closelytogether in all its parts, because the plaster is" absorbed into thepores of the cinders or similar ingredient. The mica is unburned ground6 mica and is introduced for the purpose of increasing the fireproofcharacter of the composition.

The proportions that I have found practical and to give the best resultsin the making of my said composition are as follows: fortyfive parts, byweight, of laster-ofarisfifty parts, by hweight, of coal-clnders' twoarts, by weig t, of mica""-, Three parts, b veight, of slaked lim e. I y

The silicate of sod i when purchased in the market ty-six per cent. C.P. is added to the foregoing mixture in the proportion of .002 per cent.to the entire mass. In order that the silicate of soda may be mixed 8oquickly with the parts of the composition previously compounded, so asnot to allow them to set and so as to intermingle the silicate of sodawith all parts of the composition, I prefer to mix the silicate of sodawith water in a vessETTn the proportion o'f'o ne 'a'rt of silicate Q .II a ten quic y to stir same into the mass. After the silicate of soda isadded to the composition or frames, and the contents of these molds orframes is then exposed to the atmosphere.

The slabs or blocks of the fireproof material formed of the foregoingcomposition have such consistency as to allow of their being 5 nailed towooden framework withoutsplitting or breaking, and thus form asubstitute for iron sheathing.

In the foregoing specification I have dea which is the subject-matter ofthe present ap-4 plication, but also the process of forming thecomposition is poured into suitable molds o scribed not only thecomposition of matter zoo Lit-MIL same; but I reserve to myself theright to file a separate application for patent for said process.

Having thus described my said invention,

5 what I claim, and desire to secure by Letters Patent, is

1. A composition comprising a mixture of plaster-of-paris, a porousmaterial like coalcinders, mica, slaked lime, and-asilieatemf xo soda,substantially as specified.

2. A composition comprising a mixture of pulverized plaster-of-paris,sifted coal-cinders, comminuted mica, slaked lime, and silicate of soda,substantially as specified.

,3. A composition comprising a mixture of forty-five parts of pulverizedplaster-of-paris, fifty parts of sifted coal-cinders, two parts ofcomminuted mica, three parts of slaked lime,

and silicate of soda in the proportion of .002

per cent., the whole being hardened and set, substantially as specified.

In testimony whereof I have afiixed my sign tum, in presence of twowitnesses, this 9th day of November, 1902.

HANS MOLOHIN. Witnesses MAIID .E. LE'rcHER,

ADELAIDE HENSING.

